This would be a cool place to try short-term "seat-swapping" rentals, a real "AirBnB" (ba-da-ching) as it were:

You buy a super-expensive bed-cube on a 20-hour flight, then register your flight and seat and mark a schedule when it's available for seat-swapping. "Guests" can book in 15-minute increments (on-demand if the flight has Internet). During their time, you swap seats and get to know their seat-neighbors.

Assuming an hour on each end for take-off/landing, and 8 hours you'd reserve for sleeping, that leaves 10 hours at $20/15-min = $800 recouped.